Application Layer Gateway for SIP Protocol

January 30, 2019

Contributed by:
C

Using DS-Lite with Session Initiation Protocol (SIP) is complicated, because SIP messages contain IP addresses in the SIP headers as well as in the SIP body. When LSN is used with SIP, the SIP headers contain information about the caller and the receiver, and the device translates this information to hide it from the outside network. The SIP body contains the Session Description Protocol (SDP) information, which includes IP addresses and port numbers for transmission of the media. SIP ALG for DS-Lite is compliant with RFC 3261, RFC 3581, RFC 4566, and RFC 4475.

Limitations of SIP ALG

SIP ALG for DS-Lite has the following limitations:

Only SDP payload is supported.

The following are not supported:

Multicast IP addresses

Encrypted SDP

SIP TLS

FQDN translation

SIP layer authentication

Admin partitions

Citrix ADC clusters

Multipart body

Line folding

Configuring SIP ALG

You need to configure the SIP ALG as part of the LSN configuration. For instructions on configuring LSN, see Configuring DS-Lite. While configuring LSN, make sure that you:

Set the following parameters while adding an LSN application profile:

o IP Pooling = PAIRED

o Address and Port Mapping = ENDPOINT-INDEPENDENT

o Filtering = ENDPOINT-INDEPENDENT

Create a SIP ALG profile and make sure that you define either the source port range or destination port range. Bind the SIP ALG profile to the LSN group

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